TB Skin Test, Scar on lung x-ray

Hi

for immigration purposes I had a chest x-ray done.

On my 3 chest x-rays (taken in a period of 5 months) it always showed
this mark on my left lung.Which made the docs thing I might have
inactive TB.
I got a Sputum Test done which turned out negative and the TB Skin Test
turned out negative as well.

So my question is, the doc said I don´t have to worry about, cuz it is
no TB. I asked him what else can caused this scar/mark, he couldn´t
give me proper answer, he was mummling about TB all the time, but cuz
every test turned out negative

I was wondering what else could have caused the scar/mark on my chest
x-rays/lungs?

I never had a TB History only when I was a child I had HepatitisA.

I am a bit worried. Pls tell me ur opinion.

.